﻿<!DOCTYPE html>
<html>

<head lang="en">
  <meta charset="UTF-8" />
  <title></title>
  <style type="text/css">
    * {
      margin: 0;
      padding: 0;
    }

    ul {
      list-style: none;
    }

    .wrapper {
      width: 1000px;
      height: 475px;
      margin: 0 auto;
      margin-top: 100px;
    }

    .tab {
      border: 1px solid #ddd;
      border-bottom: 0;
      height: 36px;
      width: 320px;
    }

    .tab li {
      position: relative;
      float: left;
      width: 80px;
      height: 34px;
      line-height: 34px;
      text-align: center;
      cursor: pointer;
      border-top: 4px solid #fff;
    }

    .tab span {
      position: absolute;
      right: 0;
      top: 10px;
      background: #ddd;
      width: 1px;
      height: 14px;
      overflow: hidden;
    }

    .products {
      width: 1002px;
      border: 1px solid #ddd;
      height: 476px;
    }

    .products .main {
      float: left;
      display: none;
    }

    .products .main.selected {
      display: block;
    }

    .tab li.active {
      border-color: red;
      border-bottom: 0;
    }
  </style>
</head>

<body>
  <div class="wrapper">
    <ul class="tab">
      <li class="tab-item active">国际大牌<span>◆</span></li>
      <li class="tab-item">国妆名牌<span>◆</span></li>
      <li class="tab-item">清洁用品<span>◆</span></li>
      <li class="tab-item">男士精品</li>
    </ul>
    <div class="products">
      <div class="main selected">
        <a href="###"><img src="images/guojidapai.jpg" alt="" /></a>
      </div>
      <div class="main">
        <a href="###"><img src="images/guozhuangmingpin.jpg" alt="" /></a>
      </div>
      <div class="main">
        <a href="###"><img src="images/qingjieyongpin.jpg" alt="" /></a>
      </div>
      <div class="main">
        <a href="###"><img src="images/nanshijingpin.jpg" alt="" /></a>
      </div>
    </div>
  </div>

  <script>
    /* 点击上方li元素
          1. li元素排他：  (1)兄弟移除类名active  (2)自己新增类名active
          2. main盒子排他：  (1)兄弟移除类名selected  (2)自己新增类名selected
    */

    //1.获取元素
    const liList = document.querySelectorAll('.tab>li')
    const mainList = document.querySelectorAll('.products>.main')

    //2.注册事件
    for (let i = 0; i < liList.length; i++) {
      liList[i].addEventListener('click', function () {
        //3.事件处理： 排他
        //(1)干掉其他兄弟
        document.querySelector('.tab>.active').classList.remove('active')
        document.querySelector('.products>.selected').classList.remove('selected')
        //(2)复活自己
        liList[i].classList.add('active')
        mainList[i].classList.add('selected')
      })
    }
  </script>
</body>

</html>